啟用事務完成轉賬儲存過程

 1 use StudentManager
 2 go
 3 if exists(select * from sysobjects where name='usp_TransferAccounts')
 4 drop procedure usp_TransferAccounts
 5 go
 6 create procedure usp_TransferAccounts
 7 @inputAccount int,--轉入賬戶
 8 @outputAccount int,--轉出賬戶
 9 @transferMoney int --交易金額
10 as
11     declare
 
 @errorSum int 
12     set @errorSum=0      
13     begin transaction
14        begin        
15             update CardAccount set CurrentMoney=CurrentMoney-@transferMoney
16                         where StudentId=@outputAccount
17             set @errorSum=@errorSum+@@error     
18             update
 
 CardAccount set CurrentMoney=CurrentMoney+@transferMoney
19                         where StudentId=@inputAccount
20            set @errorSum=@errorSum+@@error 
21            if(@errorSum>0)
22                 rollback transaction
23            else 
24                 commit transaction
25      end
 
    
26 go
27 --測試失敗的轉賬
28 exec usp_TransferAccounts 100002,100001,1000
29 --查詢餘額
30 select Students.StudentId,StudentName,CurrentMoney from Students
31 inner join CardAccount on Students.StudentId=CardAccount.StudentId
32 --測試成功的轉賬
33 exec usp_TransferAccounts 100002,100001,800
34 --查詢餘額
35 select Students.StudentId,StudentName,CurrentMoney from Students
36 inner join CardAccount on Students.StudentId=CardAccount.StudentId